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application in server.com uses mod_rewrite to change /serviceX to ?id=serviceX

When we register ww.serviceA.com, can we map it to a name server and pass a variable...?

I'm not positive, but it sounds like you would be better served using Apache virtual hosting. Define a virtual host for both ww.serviceA.com and ww.serviceB.com. If you need to map the connections to something specific (ie. ?id=serviceA), then you could perhaps define a RewriteRule within each virtual host, which redirects / to something else.